but with bags as big as yours
Whether I'm commuting to work, touring, or just slumming, I always carry a bicycle tire pump, tire repair kit, first aid kit, essential tools, a cover for the bike (doubles as an emergency blanket), cold weather and warm weather gloves, wind and waterproof pullover pants, paper, rags, a few bungees, maps, space blanket, candles, matches, some drinking water, et. al.
All of it stores economically and well, and after 47 motorcycle years on the road both here and abroad, I've found an emergency/breakdown 20 miles from home on the Plains or the Rockies can be as challenging as the same situation 1000 miles from home (without cellphone coverage). I never assume someone is going to stop and help, and even if I can reach a roadside assistance telephone, it can be hours (days) before help arrives.
The saddlebags on the Strats are deceptive in that they taper upward and to the rear, making for marvelous aesthetics and miserable storage problems. My "tourpack" is dedicated to some clothing, toiletries, camera, etc. When I'm commuting to work, it holds my work shoes.
This is why I love this little $9 Walmart lunchpack. Fits in a taper and keeps lots of things organized and dry: